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A
New York City
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B
Washington, D.C.
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C
Philadelphia
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D
Boston
Why this is the answer
The capital of the United States is Washington, D.C. This is a 65/20 civics question. Washington, D.C. (the District of Columbia) is home to the federal government, including the White House, the Capitol where Congress meets, and the Supreme Court. It is a federal district, not part of any state. New York City was a temporary early capital and Philadelphia hosted the Continental Congress, but the permanent national capital has been Washington, D.C. Knowing the national capital is basic geography content found on both the standard and 65/20 civics lists.
Source: USCIS Civics Question 94 (65/20) — National Capital